# Relationship history for MSHA mine 1100232

Current hierarchy: **Helm Group Inc → Conmat Inc., dba Helm Materials → Spread #2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** E Wienen & Sons Construction Company Inc → Spread #2; 1950-01-01 to 1988-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Harold E  Wienen → Spread #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold E  Wienen → E Wienen & Sons Construction Company Inc; 1950-01-01 to 1988-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Helm Group Inc → Spread #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Galena Stone Products Inc → Spread #2; 1988-03-30 to 1995-08-20; source msha-controller-operator-history
- **controller_controls_mine:** Lois J  Wienen → Spread #2; 1988-03-30 to 1995-08-20; source msha-controller-operator-history
- **controller_controls_operator:** Lois J  Wienen → Galena Stone Products Inc; 1988-03-30 to 1995-08-20; source msha-controller-operator-history
- **operator_operates_mine:** Conmat Inc., dba Helm Materials → Spread #2; 1995-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Helm Group Inc → Conmat Inc., dba Helm Materials; 1995-08-21 to current/open; source msha-controller-operator-history